@book{sVooehoeveSafwa,
  author    = {Voorhoeve, Jan},
  pages     = {75},
  publisher = {Leiden: African Studies Centre (ASC)},
  title     = {A grammar of Safwa: preliminary draft based on previous research by J. van Sambeek, checked by C.K. Mwachusa},
  year      = {1967}
}